package com.mmall.service.impl;

import com.mmall.common.Const;
import com.mmall.common.ServerResponse;
import com.mmall.common.TokenCache;
import com.mmall.dao.UserMapper;
import com.mmall.pojo.User;
import com.mmall.service.IUserService;
import com.mmall.utils.MD5Util;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.UUID;

/**
 *
 */
@Service("iUserService")
public class UserServiceImpl implements IUserService {

    @Autowired
    private UserMapper userMapper;


    @Override
    public ServerResponse<User> login(String username, String password) {
        int resultCount = userMapper.checkUsername(username);
        if (resultCount == 0){
            return ServerResponse.createByErrorMessage("用户名不存在");
        }

        //todo 密码登录MD5
        String md5Password = MD5Util.MD5EncodeUtf8(password);
        User user = userMapper.selectLogin(username,md5Password);
        if (user == null){
            return ServerResponse.createByErrorMessage("密码错误");
        }

        //处理返回值的密码 进行加密mmall-learning@localhost
        user.setPassword(StringUtils.EMPTY);
        return ServerResponse.createBySuccess("登录成功",user);
    }

    @Override
    public ServerResponse<String> register(User user) {
        ServerResponse<String> validResponse = this.checkValid(user.getUsername(),Const.USERNAME);
        if (!validResponse.isSuccess()){
            return validResponse;
        }
        validResponse = this.checkValid(user.getEmail(),Const.EMAIL);
        if (!validResponse.isSuccess()){
            return validResponse;
        }

        //MD5加密
        user.setPassword(MD5Util.MD5EncodeUtf8(user.getPassword()));
        int resultCount = 0;
        try {
            resultCount = userMapper.insert(user);
        }catch(Exception e){
            return ServerResponse.createByErrorMessage("参数错误");
        }
        if (resultCount == 0){
            return ServerResponse.createByErrorMessage("注册失败");
        }

        return ServerResponse.createBySuccessMessage("注册成功");
    }

    @Override
    public ServerResponse<String> checkValid(String str, String type) {
        if (StringUtils.isNotBlank(type)){
            //开始校验
            int resultCount = userMapper.checkUsername(str);
            if (resultCount > 0){
                return ServerResponse.createByErrorMessage("用户名已存在");
            }

            resultCount = userMapper.checkEmail(str);
            if (resultCount > 0){
                return ServerResponse.createByErrorMessage("Email已存在");
            }
        }else{
            return ServerResponse.createByErrorMessage("参数错误");
        }

        return ServerResponse.createBySuccessMessage("校验成功");
    }

    @Override
    public ServerResponse<String> selectQuestion(String username) {
        ServerResponse vaildResponse = this.checkValid(username,Const.USERNAME);
        if (vaildResponse.isSuccess()){
            //用户不存在
            return ServerResponse.createByErrorMessage("用户不存在");
        }

        String question = userMapper.selectQuestionByUsername(username);
        if (StringUtils.isNotBlank(question)){
            return ServerResponse.createBySuccess(question);
        }
        return ServerResponse.createByErrorMessage("找回密码的问题是空的");
    }

    @Override
    public ServerResponse<String> checkAnswer(String username, String question, String answer) {
        int resultCount = userMapper.checkAnswer(username,question,answer);
        if (resultCount > 0){
            //说明问题和答案是这个用户的，并正确,
            String forgetToken = UUID.randomUUID().toString();
            TokenCache.setKey(TokenCache.TOKEN_PREFIX + username,forgetToken);
            return ServerResponse.createBySuccess(forgetToken);
        }
        return ServerResponse.createByErrorMessage("问题的答案错误");
    }

    @Override
    public ServerResponse<String> forgetRestPassword(String username, String passwordNew, String forgetToken) {
        //判断是否为空或空字符串以及空格
        if (StringUtils.isBlank(forgetToken)){
            return ServerResponse.createByErrorMessage("参数错误,token需要传递");
        }
        ServerResponse vaildResponse = this.checkValid(username,Const.USERNAME);
        if (vaildResponse.isSuccess()){
            //用户不存在
            return ServerResponse.createByErrorMessage("用户不存在");
        }
        //通过运算获取到token(token是使用LD5加密使用字符和用户名进行运算,用于防止纵向越权)
        String token = TokenCache.getKey(TokenCache.TOKEN_PREFIX + username);
        if (StringUtils.isBlank(token)){
            return ServerResponse.createByErrorMessage("token无效或者过期");
        }
        //如果前端传递过来token和运算出来的token一致,则完成修改密码
        if (StringUtils.equals(forgetToken,token)){
            String md5Password = MD5Util.MD5EncodeUtf8(passwordNew);
            int rowCount = userMapper.updatePasswordByUsername(username,md5Password);

            if (rowCount > 0){
                return ServerResponse.createBySuccess("修改密码成功");
            }
        }else {
            return ServerResponse.createByErrorMessage("token错误,请重新获取重置密码的token");
        }
        return ServerResponse.createByErrorMessage("修改密码失败");
    }

    @Override
    public ServerResponse<String> RestPassword(String passwordOld, String passwordNew, User user) {
        //防止横向越权,要校验下这个用户的旧密码,一定要指定是这个用户.因为我们会查询一个count(1),如果不指定id，那么结果就是true count>0
        int resultCount  = userMapper.checkPassword(MD5Util.MD5EncodeUtf8(passwordOld),user.getId());
        if (resultCount == 0){
            return ServerResponse.createByErrorMessage("旧密码错误");
        }

        user.setPassword(MD5Util.MD5EncodeUtf8(passwordNew));
        int updateCount = userMapper.updateByPrimaryKeySelective(user);
        if (updateCount > 0){
            return ServerResponse.createBySuccessMessage("密码更新成功");
        }
        return ServerResponse.createByErrorMessage("密码更新失败");
    }

    @Override
    public ServerResponse<User> updateInformation(User user) {
        int resultCont = userMapper.checkEmailByUserId(user.getId(),user.getEmail());
        if (resultCont > 0){
            return ServerResponse.createByErrorMessage("email已存在,请更换email再尝试更新");
        }

        //用户名是不能跟新的
        User updateUser = new User();
        updateUser.setId(user.getId());
        updateUser.setEmail(user.getEmail());
        updateUser.setPhone(user.getPhone());
        updateUser.setQuestion(user.getQuestion());
        updateUser.setAnswer(user.getAnswer());

        int updateCount = userMapper.updateByPrimaryKeySelective(updateUser);

        if (updateCount > 0){
            return ServerResponse.createBySuccessMessage("用户信息更新成功");
        }
        return ServerResponse.createByErrorMessage("用户信息更新失败");
    }

    @Override
    public ServerResponse<User> getInfirmation(Integer id) {
        User user = userMapper.selectByPrimaryKey(id);
        if (user == null){
            return ServerResponse.createByErrorMessage("找不到当前用户");
        }
        user.setPassword(StringUtils.EMPTY);
        return ServerResponse.createBySuccess(user);
    }

    @Override
    public ServerResponse checkAdminRole(User user) {
        if (user != null && user.getRole().intValue() == Const.Role.ROLE_ADMIN){
            return ServerResponse.createBySuccess();
        }
        return ServerResponse.createByError();
    }
}
